69 lines
4.6 KiB
HTML
69 lines
4.6 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-13" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Using multiple iSCSI HBAs for redundancy</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<img src="delta.gif" alt="Start of change" /><img src="delta.gif" alt="Start of change" /><img src="delta.gif" alt="Start of change" />
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<a name="rzahqusingmultiscsihbas"></a>
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<h4 id="rzahqusingmultiscsihbas">Using multiple iSCSI HBAs for redundancy</h4>
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<p>Even if the bandwidth requirements of a server do not indicate that more
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than one iSCSI HBA for iSeries™ is needed, you may want to use multiple iSCSI HBAs
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to provide fault tolerance and redundancy. This will reduce the likelihood
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of server failures that are caused by a failure of an iSCSI HBA or one of
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the network components (switches, cables, and so on.) that connect the iSeries to the hosted system. Redundancy is provided by the iSCSI ability to
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do multi-path I/O (see <a href="rzahqadvancediscsihardware.htm#rzahqadvancediscsihardware">Advanced iSCSI support</a>). To take
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advantage of multi-path I/O, you create a multi-path group that identifies
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two or more iSCSI HBAs. Then you define which virtual disks will use the
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multi-path group. You can optionally use the multi-path group as the default
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path when linking disk drives.</p>
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<p>To define a multi-path group using iSeries Navigator, first shut down the server
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(see <a href="rzahqstartnstop.htm#rzahqstartnstop">Start and stop an integrated server</a>), then follow these steps:</p>
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<ol type="1">
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<li>Expand <span class="bold">Integrated Server Administration</span>.</li>
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<li>Expand <span class="bold">Servers</span>.</li>
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<li>Right-click a server from the list available.</li>
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<li>Select <span class="bold">Properties</span>.</li>
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<li>Click on the <span class="bold">Storage Paths</span> tab.</li>
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<li>Define at least two storage paths (use the <span class="bold">Add</span> button,
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if necessary).</li>
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<li>Below the storage paths table, click the <span class="bold">Properties</span> button
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for the multi-path group.</li>
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<li>Use the checkboxes to identify two or more of the defined storage paths
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to be members of the multi-path group.</li>
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<li>Click <span class="bold">OK</span> to update the multi-path group information
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on the server properties panel.</li>
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<li><span class="bold">Optional:</span> Select the multi-path group as the default
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path for disk drives.</li>
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<li>Click <span class="bold">OK</span> on the server properties panel to save
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the changes in the NWSD.</li></ol>
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<p>If you want to use a CL command, see the MLTPTHGRP and DFTSTGPTH keywords
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on the CHGNWSD command.</p>
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<p>Now that the multi-path group is defined, you need to re-link one or more
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of the server's virtual disks in order to use the multi-path group.
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First unlink the disk (see <a href="rzahqunlpi.htm#rzahqunlpi">Unlink integrated Windows server disk drives</a>). Then link the disk
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to the server again (see <a href="rzahqlstpi.htm#rzahqlstpi">Link a disk drive to an integrated server</a>), specifying either the
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multi-path group explicitly or specifying the default path (if the default
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path for disk drives was defined to use the multi-path group).</p><img src="deltaend.gif" alt="End of change" /><img src="deltaend.gif" alt="End of change" /><img src="deltaend.gif" alt="End of change" />
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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